Table 3.

Prevalence of respiratory symptoms in the last 12 months in the parquet manufacturers with duration of exposure at the actual workplace more and less than 15 years

Respiratory symptoms in the last 12 months	Duration of exposure > 15 years	Duration of exposure < 15 years	P-value*
Overall respiratory symptoms	12/16 (75.0%)	4/16 (25.0%)	0.037
Cough	8/11 (72.7%)	3/11 (27.3%)	0.040
Phlegm	5/6 (83.3%)	1/6 (16.7%)	0.014
Dyspnea	2/4 (50.0%)	2/4 (50.0%)	1.000
Wheezing	2/3 (66.6%)	1/3 (33.3%)	0.083
Chest tightness	2/5 (40.0%)	3/5 (60.0%)	0.108

Data are expressed as number and percentage of study subjects with certain variable.

^*Tested by Chi-square test (or Fisher’s exact test where appropriate).